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中文摘要：
目的研究第一恒磨牙功能障碍和颞下颌关节紊乱病（TMD）的关系和发病机制，为预防第一磨牙龋损而导致的TMD提供流行病学依据。方法以2007-2011年在口腔科体检者为对象，检查第一恒磨牙龋损及依照TMD临床诊断标准进行流行病学研究，分析第一磨牙严重病变状况和TMD发病之间的关系。结果受测人群中第一恒磨牙功能障碍TMD阳性率为51．48％，无障碍者TMD阳性率为23．47％，第一磨牙功能障碍的受测者TMD阳性率远远高于功能正常者（X^2=54．34，P〈0．01）。结论第一磨牙功能障碍可能是引起TMD的易感因素之一，易感人群需要保护。
英文摘要：
Objective To observe the pathogenic relationship and the mechanisms between the first molars and the temporomandibular disorders （TMD） by getting epidemiology data. Methods The oral examinational people during 2007 to 2011 as investigating objects were selected and epidemiological study was carried out with standard clinical diagnostic criteria for dental caries TMD. Results The people with dysfunctional first molars showed that TMD positive rate was 51.48%, and normal molars was 23.47%. The results had significant difference （X^2 = 54.34, P 〈0.01 ）. Conclusion The people with dysfunction of first molars may be liable to TMD.
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